Mitsubishi MSZ-HC35VA Service Manual download pdf (Page 33)

F Check of compressor start failure

After the compressor is heated with a drier,

does the compressor start?

Replace the compressor.

Compressor start failure. Activate pre-heat control.

(Refer to 10-2. "PRE-HEAT CONTROL SETTING")

Yes

Does the compressor run for 10 seconds or

more after it starts?

Check the refrigerant circuit.

Check the stop valve.

Yes

Heat the compressor with

a drier for about 20 minutes.

Do not recover refrigerant

gas while heating.

Heating part

Conﬁ rm that ~ is normal.

•Electrical circuit check

. Contact of the compressor connector (Including CN61)

. Output voltage of inverter P.C. board and balance of them (See 11-5.

)

. Direct current voltage between DB61(+) and (-) on the inverter P.C. board

. Voltage between outdoor terminal block S1-S2

Is the thermistor normal? (Refer to 11-6.1.)

Reconnect the connector of thermistor.

Turn ON the power supply and press EMERGENCY OPERATION switch.

Replace the thermistor except RT64. When RT64

is abnormal, replace the inverter P.C. board.

Does the unit operate for 10 minutes or more

without showing thermistor abnormality?

OK.

(Cause is poor contact.)

Replace the inverter P.C. board.

Thermistor Symbol Connector, Pin No. Board

Defrost RT61 Between CN641 pin1 and pin2

Inverter P.C. boardDischarge temperature RT62 Between CN641 pin3 and pin4

Fin temperature RT64 Between CN642 pin1 and pin2

Yes

G Check of outdoor thermistors

Disconnect the connector of thermistor in the outdoor P.C. board (see

below table), and measure the resistance of thermistor.

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 43 44

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Mitsubishi MSZ-HC35VA Service Manual Page 33